#include <func.h>

int main(int argc, char *argv[])
{
    ARGS_CHECK(argc, 3);

    // 1. 生成套接字描述符
    int sfd = socket(AF_INET, SOCK_STREAM, 0);

    
    struct sockaddr_in ser_addr; // 服务器信息结构体
    bzero(&ser_addr, sizeof(ser_addr));
    ser_addr.sin_family = AF_INET; // 使用IPv4
    ser_addr.sin_port = htons(atoi(argv[2])); // 端口号
    ser_addr.sin_addr.s_addr = inet_addr(argv[1]); // IP地址

    // 2. bind
    int ret = bind(sfd, (struct sockaddr *)&ser_addr, sizeof(ser_addr));
    ERROR_CHECK(ret, -1, "bind");

    // 3. listen
    ret = listen(sfd, 10);

    // 4. accept 进行三次握手
    struct sockaddr_in client_addr; // 客户端信息结构体
    bzero(&client_addr, sizeof(client_addr));
    int addr_len = sizeof(client_addr);
    // 实际用来和客户端通信的标识符
    int new_fd = accept(sfd, (struct sockaddr *)&client_addr, &addr_len);
    ERROR_CHECK(new_fd, -1, "accept");
    printf("client %s %d success connect\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

    // select实现实时聊天
    fd_set rdset;
    char buf[128] = {0};
    while (1)
    {
        FD_ZERO(&rdset);
        FD_SET(new_fd, &rdset);
        FD_SET(STDIN_FILENO, &rdset);
        select(new_fd + 1, &rdset, NULL, NULL, NULL);
        // 可发
        if (FD_ISSET(STDIN_FILENO, &rdset))
        {
            bzero(buf, sizeof(buf));
            read(STDIN_FILENO, buf, sizeof(buf));
            send(new_fd, buf, strlen(buf) - 1, 0);
        }

        // 可收
        if (FD_ISSET(new_fd, &rdset))
        {
            bzero(buf, sizeof(buf));
            ret = recv(new_fd, buf, sizeof(buf), 0);
            if (!ret) 
            {
                printf("The other side break the chat\b");
                break;
            }
            printf("%s\n", buf);
        }
    }

    close(sfd);
    close(new_fd);
    return 0;
}
